notching

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A term referring to small grooves on the inferior face of the ribs, usually the 4th-8th thoracic ribs, seen on a plain film of 70% of older children and adults with uncorrected post-ductal—ductus arteriosus—coarctation of the aorta, due to ‘tracks’ from the pressure of dilated intercostal collateral vessels on the ribs

notching

Radiology Small grooves on the anterior aspect of ribs seen on a plain CXR of children with post-ductal–ductus arteriosus coarctation of the aorta, due to 'tracks' from the pressure of collateral vessels on the ribs.